Fix bad scaling in TiledLayer

cc/resources/layer_updater.h

Index: cc/resources/layer_updater.h
diff --git a/cc/resources/layer_updater.h b/cc/resources/layer_updater.h
index 258d2be9a173583bcd5d734286f68d63af8bb02e..4614c5a39895005d8c71c8b30cc2691017160f21 100644
--- a/cc/resources/layer_updater.h
+++ b/cc/resources/layer_updater.h
@@ -8,6 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
+#include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/vector2d.h"
 
@@ -46,7 +47,8 @@ class CC_EXPORT LayerUpdater : public base::RefCounted<LayerUpdater> {
 
   virtual scoped_ptr<Resource> CreateResource(
       PrioritizedResourceManager* manager) = 0;
-  virtual void PrepareToUpdate(const gfx::Rect& content_rect,
+  virtual void PrepareToUpdate(const gfx::Size& content_size,
+                               const gfx::Rect& paint_rect,
                                const gfx::Size& tile_size,
                                float contents_width_scale,
                                float contents_height_scale) {}
@@ -58,6 +60,7 @@ class CC_EXPORT LayerUpdater : public base::RefCounted<LayerUpdater> {
   // Set true by the layer when it is known that the entire output bounds will
   // be rasterized.
   virtual void SetFillsBoundsCompletely(bool fills_bounds) {}
+  virtual void SetBackgroundColor(SkColor background_color) {}
 
  protected:
   virtual ~LayerUpdater() {}